[WHO classification of myeloid neoplasms]

In 2014, two advisory committees (one each for myeloid and lymphoid neoplasms) of about 100 pathologists, hematologists, oncologists, and geneticists met in Chicago to revise the WHO diagnostic criteria. The goal was to define disease entities that should be modified, removed, or added based on new insights. In particular, to improve a biologically meaningful classification, a number of new molecular genetic markers were included, which had proved to be of diagnostic and/or prognostic relevance. The resulting differentiated diagnostic procedure is a challenge for the hematopathologist. Not only is it necessary to pool the information from a multimodal diagnostic process and to compare the results of morphology, immunophenotyping, and clinical information. It is also essential to integrate the techniques of fluorescence in situ hybridization and next generation sequencing into the diagnostic process. Hematopathological diagnostics have become more labor-intensive and cost-intensive as a result of this further differentiation.